using Microsoft.Extensions.Logging;
using JGSY.CMS.LowCode.Platform.Application.Interfaces;
using JGSY.CMS.LowCode.Platform.Infrastructure.CmsDbContext;

namespace JGSY.CMS.LowCode.Platform.Application.Services
{
    /// <summary>
    /// 租户监控服务实现
    /// Phase 4: 基础实现 - 提供接口契约满足，后续迭代完善业务逻辑
    /// </summary>
    public class TenantMonitoringService : ITenantMonitoringService
    {
        private readonly LowCodeDbContext _context;
        private readonly ILogger<TenantMonitoringService> _logger;

        public TenantMonitoringService(
            LowCodeDbContext context,
            ILogger<TenantMonitoringService> logger)
        {
            _context = context;
            _logger = logger;
        }

        // 系统监控
        public async Task<object> GetSystemMetricsAsync(Guid tenantId)
        {
            _logger.LogInformation("Getting system metrics for tenant {TenantId}", tenantId);
            return await Task.FromResult(new {
                tenantId = tenantId.ToString(),
                cpu = new { usage = 0.0, cores = 1 },
                memory = new { used = 0, total = 1073741824, unit = "bytes" },
                disk = new { used = 0, total = 10737418240, unit = "bytes" },
                network = new { inbound = 0, outbound = 0, unit = "bytes" },
                timestamp = DateTime.UtcNow
            });
        }

        public async Task<List<object>> GetSystemMetricsHistoryAsync(Guid tenantId, DateTime startTime, DateTime endTime)
        {
            _logger.LogInformation("Getting system metrics history for tenant {TenantId} from {Start} to {End}", 
                tenantId, startTime, endTime);
            return await Task.FromResult(new List<object>());
        }

        public async Task<object> GetSystemHealthAsync(Guid tenantId)
        {
            _logger.LogInformation("Getting system health for tenant {TenantId}", tenantId);
            return await Task.FromResult(new {
                tenantId = tenantId.ToString(),
                status = "healthy",
                uptime = TimeSpan.FromDays(1).TotalSeconds,
                lastCheck = DateTime.UtcNow,
                services = new List<object>()
            });
        }

        // 性能监控
        public async Task<object> GetPerformanceMetricsAsync(Guid tenantId)
        {
            _logger.LogInformation("Getting performance metrics for tenant {TenantId}", tenantId);
            return await Task.FromResult(new {
                tenantId = tenantId.ToString(),
                responseTime = new { average = 0.0, max = 0.0, min = 0.0, unit = "ms" },
                throughput = new { requestsPerSecond = 0.0 },
                errorRate = new { percentage = 0.0 },
                timestamp = DateTime.UtcNow
            });
        }

        public async Task<List<object>> GetPerformanceMetricsHistoryAsync(Guid tenantId, DateTime startTime, DateTime endTime)
        {
            _logger.LogInformation("Getting performance metrics history for tenant {TenantId}", tenantId);
            return await Task.FromResult(new List<object>());
        }

        public async Task<object> GeneratePerformanceReportAsync(Guid tenantId, DateTime startTime, DateTime endTime)
        {
            _logger.LogInformation("Generating performance report for tenant {TenantId}", tenantId);
            return await Task.FromResult(new {
                tenantId = tenantId.ToString(),
                reportId = Guid.NewGuid(),
                status = "completed",
                generatedAt = DateTime.UtcNow
            });
        }

        // 用户活动监控
        public async Task<object> GetUserActivityAsync(Guid tenantId)
        {
            _logger.LogInformation("Getting user activity for tenant {TenantId}", tenantId);
            return await Task.FromResult(new {
                tenantId = tenantId.ToString(),
                activeUsers = 0,
                totalSessions = 0,
                averageSessionDuration = 0.0,
                timestamp = DateTime.UtcNow
            });
        }

        public async Task<List<object>> GetUserActivityHistoryAsync(Guid tenantId, DateTime startTime, DateTime endTime)
        {
            _logger.LogInformation("Getting user activity history for tenant {TenantId}", tenantId);
            return await Task.FromResult(new List<object>());
        }

        public async Task<object> GetUserActivitySummaryAsync(Guid tenantId, DateTime date)
        {
            _logger.LogInformation("Getting user activity summary for tenant {TenantId} on {Date}", tenantId, date);
            return await Task.FromResult(new {
                tenantId = tenantId.ToString(),
                date = date.ToString("yyyy-MM-dd"),
                totalUsers = 0,
                activeUsers = 0,
                newUsers = 0
            });
        }

        // 错误监控
        public async Task<List<object>> GetErrorLogsAsync(Guid tenantId, int pageIndex = 0, int pageSize = 50)
        {
            _logger.LogInformation("Getting error logs for tenant {TenantId}", tenantId);
            return await Task.FromResult(new List<object>());
        }

        public async Task<object> GetErrorLogAsync(Guid errorId)
        {
            _logger.LogInformation("Getting error log {ErrorId}", errorId);
            return await Task.FromResult(new {
                id = errorId,
                status = "not_found"
            });
        }

        public async Task<object> GetErrorStatisticsAsync(Guid tenantId, DateTime startTime, DateTime endTime)
        {
            _logger.LogInformation("Getting error statistics for tenant {TenantId}", tenantId);
            return await Task.FromResult(new {
                tenantId = tenantId.ToString(),
                totalErrors = 0,
                resolvedErrors = 0,
                errorRate = 0.0
            });
        }

        public async Task MarkErrorAsResolvedAsync(Guid errorId, string resolution)
        {
            _logger.LogInformation("Marking error {ErrorId} as resolved: {Resolution}", errorId, resolution);
            await Task.CompletedTask;
        }

        // 警报管理
        public async Task<List<object>> GetAlertsAsync(Guid tenantId)
        {
            _logger.LogInformation("Getting alerts for tenant {TenantId}", tenantId);
            return await Task.FromResult(new List<object>());
        }

        public async Task<object> CreateAlertAsync(Guid tenantId, object request)
        {
            _logger.LogInformation("Creating alert for tenant {TenantId}", tenantId);
            return await Task.FromResult(new { id = Guid.NewGuid(), tenantId = tenantId.ToString(), status = "created" });
        }

        public async Task<object> UpdateAlertAsync(Guid alertId, object request)
        {
            _logger.LogInformation("Updating alert {AlertId}", alertId);
            return await Task.FromResult(new { id = alertId, status = "updated" });
        }

        public async Task DeleteAlertAsync(Guid alertId)
        {
            _logger.LogInformation("Deleting alert {AlertId}", alertId);
            await Task.CompletedTask;
        }

        public async Task<List<object>> GetTriggeredAlertsAsync(Guid tenantId)
        {
            _logger.LogInformation("Getting triggered alerts for tenant {TenantId}", tenantId);
            return await Task.FromResult(new List<object>());
        }

        // 实时监控
        public async Task<object> GetRealTimeMetricsAsync(Guid tenantId)
        {
            _logger.LogInformation("Getting real-time metrics for tenant {TenantId}", tenantId);
            return await Task.FromResult(new {
                tenantId = tenantId.ToString(),
                timestamp = DateTime.UtcNow,
                metrics = new { }
            });
        }

        public async Task StartRealTimeMonitoringAsync(Guid tenantId)
        {
            _logger.LogInformation("Starting real-time monitoring for tenant {TenantId}", tenantId);
            await Task.CompletedTask;
        }

        public async Task StopRealTimeMonitoringAsync(Guid tenantId)
        {
            _logger.LogInformation("Stopping real-time monitoring for tenant {TenantId}", tenantId);
            await Task.CompletedTask;
        }

        // 报告生成
        public async Task<byte[]> GenerateMonitoringReportAsync(Guid tenantId, DateTime startTime, DateTime endTime, string format = "pdf")
        {
            _logger.LogInformation("Generating monitoring report for tenant {TenantId} in {Format} format", tenantId, format);
            // TODO: Implement actual report generation
            return await Task.FromResult(new byte[0]);
        }

        public async Task<byte[]> GenerateDashboardAsync(Guid tenantId, string format = "pdf")
        {
            _logger.LogInformation("Generating dashboard for tenant {TenantId} in {Format} format", tenantId, format);
            // TODO: Implement actual dashboard generation
            return await Task.FromResult(new byte[0]);
        }

        // 阈值管理
        public async Task<List<object>> GetThresholdsAsync(Guid tenantId)
        {
            _logger.LogInformation("Getting thresholds for tenant {TenantId}", tenantId);
            return await Task.FromResult(new List<object>());
        }

        public async Task<object> CreateThresholdAsync(Guid tenantId, object request)
        {
            _logger.LogInformation("Creating threshold for tenant {TenantId}", tenantId);
            return await Task.FromResult(new { id = Guid.NewGuid(), tenantId = tenantId.ToString(), status = "created" });
        }

        public async Task<object> UpdateThresholdAsync(Guid thresholdId, object request)
        {
            _logger.LogInformation("Updating threshold {ThresholdId}", thresholdId);
            return await Task.FromResult(new { id = thresholdId, status = "updated" });
        }

        public async Task DeleteThresholdAsync(Guid thresholdId)
        {
            _logger.LogInformation("Deleting threshold {ThresholdId}", thresholdId);
            await Task.CompletedTask;
        }

        // 趋势分析
        public async Task<object> AnalyzeTrendsAsync(Guid tenantId, string metricType, DateTime startTime, DateTime endTime)
        {
            _logger.LogInformation("Analyzing trends for tenant {TenantId}, metric {MetricType}", tenantId, metricType);
            return await Task.FromResult(new {
                tenantId = tenantId.ToString(),
                metricType = metricType,
                trend = "stable",
                analysis = "No significant changes detected"
            });
        }

        public async Task<List<object>> PredictTrendsAsync(Guid tenantId, string metricType, int days = 30)
        {
            _logger.LogInformation("Predicting trends for tenant {TenantId}, metric {MetricType} for {Days} days", 
                tenantId, metricType, days);
            return await Task.FromResult(new List<object>());
        }
    }
}
